Improvement in embroidery attachments for sewing-machines



y VA. W. IUHNSON. Embruidering Attachments fqr Sewing-Machines. `N0 ]42,\478 v Patented September2,187y3.

Witnesses:

UNITED STATES PATENT @Errea ALBERT W. JOHNSON, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT IN EMBROIDERY ATTACHMENTS FOR SEWINGMACHINES.

Specification forming part of Letters Patent No. 142,473, dated September' 2,1873; application led July 24, 1873.

To all whom it may concern:

Be it known that I, ALBERT W. JOHNSON, of New Haven, in the county of New Haven and State of Connecticut, have invented a` provement in embroidery attachment for sewing-machines; and the invention'consists in attaching to the thread-carriers of a sewingmachine embroidery attachment an adjustable tension device, as hereinafter described, whereby the embroidery-thread, 85e., may be evenly and accurately adjusted to any desired tension.

In the accompanying sheet of drawings, Figure l is a plan view of embroidery attachment with my improved tension device, and Fig. 2 a side elevation of same.

Similar letters of reference indicate like parts in the several drawings.

A represents an embroidery attachment; B B', the thread-carriers, which have au alternate parallel sliding motion, substantially as described in Letters Patent of the United States issued to me on the 11th day of October, 1870. To the rear end of each of the thread-carriers B B is secured a thin elastic plate of metal, C, which I call a tension-plate, formed to correspond to the general outline of the shape of the rear end of the thread-carrier B. The inner end of the plate C is screwed or riveted fast to the thread-carrier, and the outer end of said plate has formed in it a slot, c, the slotted end being` slightly turned down. Secured to each of the thread-carriers is a screw, d, which passes through a hole in the tensionplate C. Onto this screw is .fitted a thumbnut, e.

My tension device being constructed substantially as above described, its operation is as follows: The embroidery-thread 7c from the spool f is passed into the slot c under the outer end of the tension-plate C, and thence through the openings g h in the fork of the carrier onto the fabric to be embroidered. In order to adjust the tension of the embroidery-thread 7c, it is simply necessary to screw down the thumb-nut e, when the tension-plate C is pressed down, conlining the thread more or less between said plate and the thread-carrier. The tighter the thread is thus compressed the tighter will the tension be; and in this way the tension may be tightened or loosened by screwing up or down the thumb-nut e.

What I do claim as new, and desire to secureby Letters Patent, is-

The combination, with the reciprocating thread-carriers, of the elastic tension-plates C, bent and slotted 4at their ends, and adjusted by means of a screw and thumb-nut, as and for the purpose described.

ALBERT W. JOHNSON.

Vitnesses:

H. L. WATTENBERG, G. M. PLYMPTON. 

